Insulator.



M. T. A. KUBIERSGHKY & P. E. HERKNER.

INSULATOR.

APPLIUATION FILED 00T. 19,1904.

Patented 0@1;.19,1909.

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unir s: ras erica MARTIN T. A.- KUBIERSCHKY AND PAUL E. HEB/KNEE, FBERLIN, GERMANY.

INSULATOR.

T o all whom it may concern:

Be it known that we, MARTIN T. A. KU- BInRscI-IKY and PAUL E. Hnnnnnn,of Berlin, Germany, have invented certain new and useful Improvements inInsulators, of which the following is a specification.

The presentinvention relates to the suspension of electric trolleywires, and more particularly to insulating supports.

In the suspension systems heretofore in use, it has been the practice toprovide one insulator at the point of connection of the trolley wire tothe cross suspender wire and another insulator near each end of thesuspender wire in order to obtain the necessary double insulation. rilhefirst insulator is usually well protected from injury and against rainby a metallic casing having a circular projection, while the otherinsulators are not protected from injury nor is there any provision tokeep off rain. The consequence is that while the end insulators performtheir desired function in dry weather they entirely fail to act asinsulators when wet. Moreover, the employment of three insulators toeach cross suspender is objectionable both from esthetic and economicalstand points.

The object of this invention is to provide an insulating support whichwill provide the necessary double insulation for the trolley wire, andfill the oftice of the three insulators heretofore necessarily employedand at less expense.

In carrying out the invention the inclosing shell is made somewhatlarger than the shells of prior devices, and between the inner walls ofthe shell and the suspender bolt are arranged a plurality of thicknessesof insulation.

For a betterl understanding of the invention reference may be had to thefollowing detailed description and the accompanying drawing forming apart of this specification in which,

Figure 1 is a vertical section of an insulating support embodying oneform of the invention; Fig. 2 is a similar View showing an increasednumber of insulating layers and strengthening forms; Figs. 3 and 4L showmodied forms of the insulator; and Fig. 5 is a top plan view of theinsulator shown in Fig. 3.

In the construction shown in Figs. 1 and 2, the metallic holder 1 isprovided with a downwardly projecting flange or petticoat Specificationof Letters Patent.

Application led October 19, 1904.

Patented ct. 19, 1909.

Serial No. 229,205.

2 with a ledge or shoulder 3 projecting from its inner upper end, twowire engaging arms l extending radially from its outer surfaces, and' atits top edge with a threaded crown flange for the reception of athreaded cap 5. Supported on the ledge or shoulder 3 is an intermediateinsulator 6 consisting of a metallic shell 7 having a discoidal top Sand a ring flange 9 with shoulders 10 near its opposite edges and alayer of insulation 11 surrounding the outer surface of the cap. Theobject of introducing the metallic shell 7 is to give greater strengthand to protect the first layer of insulation, provide a better seat forthe second layer of insulation, and

toenable the assembled parts to be more.

readily tested individually by a volt meter. The inner surface of theflange 9 is screwthreaded for the reception of a ring nut 12 having aninwardly projecting shoulder 13 on its upper surface. Upon this shouldera -second intermediate insulator 6 may be placed as in Fig. 2 or theinsulated bolt 14; may be seated directly as in Fig. 1.

In the construction shown in Fig. 3 the holder 1 is made with aninverted recess 15 screw-threaded at its lower end for the reception ofa removable petticoat 16 having a shoulder at its upper end. Upon thisshoulder is seated a molded insulator 6 formed with an intermediatepetticoat 17 and provided with a shoulder near its upper end for thereception of the head of the insulated bolt 141-. Over the upper end ofthe bolt a layer 18 of yieldable insulating material is placed.

In the construction shown in Fig. a the intermediate insulator 6 issupported as in the construction shown in Figs. 1 and 2, but instead ofsupporting the insulated bolt 14 at the upper end thereof the lower endis provided with a depending flange 19 screwthreaded to engage a threadupon the upper end of a shouldered petticoat 2O adapted to support theinsulated bolt 1 4.

l/Ve do not desire to restrict ourselves to the particular form orarrangement of parts herein described, and shown; since it is apparentthat they may be changed and modified without departing from ourinvention.

What we claim as new and desire to secure by Letters Patent of theUnited States, is:

1. The combination of a metallic supporting shell having ascrew-threadedportion,

an insulated bolt, an independent insulator surrounding saidA insulatedbolt to effect double insulation thereof, and a removable metallic partin engagement with the screwthreaded portion of the shell.

2. The combination of a metallic supporting shell, an insulated bolt,and an independent iiisulator surrounding said insulated bolt andconsisting of a shouldered metallic form With insulating materialsecured to the surface thereof.

3. The combination of a shouldered metallic shell, an insulated bolt,and an independent insulator consisting of a metallic form surrounded byinsulating material and having a removable inner shoulder.

il. The combination of a metallic shell, an insulated bolt, a pluralityof independent insulators surrounding' each other and the said insulatedbolt whereby a multiple iiisulation is interposed between bolt andshell,

and means for detachably connecting said parts together.

In Witness whereof We have hereunto set our hands this twenty-ninth dayof September, 1904.

MARTIN 'l. A. KUBIERSCHKY. PAUL E. HERKNER.

Titnesses HENRY HASPER, WOLDEMAR HAUPT.

